Index: lib/src/intersection_selector.dart |
diff --git a/lib/src/intersection_selector.dart b/lib/src/intersection_selector.dart |
new file mode 100644 |
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--- /dev/null |
+++ b/lib/src/intersection_selector.dart |
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+// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
+// for details. All rights reserved. Use of this source code is governed by a |
+// BSD-style license that can be found in the LICENSE file. |
+ |
+import '../boolean_selector.dart'; |
+import 'union_selector.dart'; |
+ |
+/// A selector that matches inputs that both of its sub-selectors match. |
+class IntersectionSelector implements BooleanSelector { |
+ final BooleanSelector _selector1; |
+ final BooleanSelector _selector2; |
+ |
+ Iterable<String> get variables sync* { |
+ yield* _selector1.variables; |
+ yield* _selector2.variables; |
+ } |
+ |
+ IntersectionSelector(this._selector1, this._selector2); |
+ |
+ bool evaluate(semantics) => |
+ _selector1.evaluate(semantics) && _selector2.evaluate(semantics); |
+ |
+ BooleanSelector intersection(BooleanSelector other) => |
+ new IntersectionSelector(this, other); |
+ |
+ BooleanSelector union(BooleanSelector other) => |
+ new UnionSelector(this, other); |
+ |
+ void validate(bool isDefined(String variable)) { |
+ _selector1.validate(isDefined); |
+ _selector2.validate(isDefined); |
+ } |
+ |
+ String toString() => "($_selector1) && ($_selector2)"; |
+} |